Fish Pots Research Articles

Assessment of sustainable baits for passive fishing gears through automatic fish behavior recognition

Low-impact fishing gear, such as fish pots, could help reduce human’s impact on coastal marine ecosystems in fisheries but catch rates remain low and the harvest of resources used for baiting increases their environmental cost. Using black seabreams (Spondyliosoma cantharus) as target species in the Bay of Biscay, we developed and assessed the efficiency of biodegradable biopolymer-based baits (hereafter bio-baits) made of cockles (Cerastoderma edule) and different biopolymer concentrations. Through a suite of deep and machine learning models, we automatized both the tracking and behavior classification of seabreams based on quantitative metrics describing fish motion. The models were used to predict the interest behavior of seabream towards the bait over 127 h of video. All behavior predictions categorized as interested to the bait were validated, highlighting that bio-baits have a much weaker attractive power than natural bait yet with higher activity after 4 h once natural baits have been consumed. We also show that even with imperfect tracking models, fine behavioral information can be robustly extracted from video footage through classical machine learning methods, dramatically lifting the constraints related to monitoring fish behavior. This work therefore offers new perspectives both for the improvement of bio-baits and automatic fish behavior recognition.

Length Weight Relationship and Enviromental Condition of Red Snapper (Lutjanus sp.) of Polyvinyl Chloride (PVC) Modified Trap Fishing in Bunyu Waters

The characteristics of Bunyu Island as a small island which was surrounded by the sea, has capture fisheries resource potential in an abundant, one of them is red snapper (Lutjanus sp.). These fish was caught by using bottom fish pots from bamboo with one entrance. The aims of the study were to determine the weight length and the aquatics environmental conditions correlation of the red snapper fishing ground (Lutjanus sp.) which was caught by modified bottom fish pots with poly vinyl chloride (PVC) in Bunyu Waters. The research was conducted in September - October 2020. The results showed that the growth of red snapper was negative allometric. The results of partial and simultaneous regression tests show that there is no positive effect of water condition factors (temperature, dissolved oxygen, salinity and brightness) on catches of red snapper (Lutjanus sp.) with modified bottom fish pots

Using fish behavior to design a fish pot: Black seabream (Spondyliosoma cantharus) case study

The French fishing industry is becoming increasingly environmentally aware and likely to adopt more sustainable fishing gears. As a result, fishers are showing a growing interest in sustainable fish pots. This experiment aimed to develop a fish pot concept specifically based on target species behavior in French coastal waters. First, the consultation led with fishers indicated the black seabream as the main species of interest. Then, the pot’s characteristics were defined to comply with fishing regulations. The conception process of the pot was led step-by-step by gradually testing a pot design appropriated to black seabream’s natural behavior. The approach and feeding behaviors of black seabream were described using underwater video combined to an ethogram. The experiment led to a prototype of fish pot, which provide fishers with an innovative fishing gear.

An ecological study and its fishery potential of the mud crab, Scylla serrata (Forskål, 1775) in Segara Anakan mangrove waters, Cilacap, Indonesia

Segara Anakan mangrove waters is a lagoon surrounded by mangrove forests and muddy land. Mangrove forests have an ecological function such as spawning ground, nursery ground, and feeding ground for various biota. Mud crab is one of fishery commodities, which is important in Indonesia. Segara Anakan mangrove waters, is one of the fishing villages which catch mud crabs because of the high demand. The high demand for mud crabs needs to be balanced with the right management strategy, so that the population will not extinction. The purpose of this study is to determine the ecology of mud crab, Scylla serrata Forskål, 1775 and its fishery potential and also to explain the habitat population in the Segara Anakan mangrove forest. Many previous studies conducted by previous researchers. Environmental parameters, i.e. temperature, salinity, oxygen, light penetration, and nature of the bottom were also studied. Crabs were caught by traditional crab catch fishery called “Wadong” (fish pot). Around 6487 crabs were caught by “wadong”. The catch consisted of 2920 male crabs (45.02%) and 3567 female crabs (54.98%). The dominant size groups for males and females in terms of their carapace length (CL) were 35.00-40.00 mm and 43.00-106.00 mm, respectively. Females mature at smaller size, i.e. at 42.70 mm CL. Breeding takes places during June-July. CL weight relationship showed that males were heavier than females. The regression equations for both sexes are as follows: WF= 10-3 5.871 L2.4443 (r= 0.999) and WM= 10-4 4.043 L3.1035 (r= 0.999).

Length‐weight relationship of 12 demersal fish species in the Canary Islands (Spain, CE Atlantic)

Length-weight relationships (LWR) of twelve fish species collected by fish pots (half an inch mesh size), bottom horizontal longlines (hook size 3/0) and set gillnets (80 mm mesh size) from two Marine Protected Areas in the Canary Islands were determined using individual fish records collected at least once a year during ten scientific surveys between 2003 and 2010, excluding 2007. Fish was measured fresh for the total length (to the lower 0.1 or 0.5 cm, depending on the scientific surveys design) and weighted for the total weight (TW, to the 0.1 g). With the exception of Bathytoshia centroura with a b-value of 1.77, the LWR parameter b ranged between 2.71 (Heteropriacanthus cruentatus (Lacepède, 1801)) and 3.86 (Gymnothorax maderensis (Johnson, 1862)). All LWRs were obtained from well-adjusted linear regressions with R2 ≥0.74. In addition, six new maximum lengths were recorded for six of the sampled species. Data presented herein expand the knowledge base for these species in the Archipelago, as they have limited or no LWR data available.

Trophic inferences of the gray triggerfish Balistes capriscus based on stable isotopes analyses, in the Colombian Caribbean

The demersal fish are a commercial resource of small-scale fisheries of northern Colombian Caribbean. Balistes capriscus is frequently and important in fishing landings, but this species has not economic value and its trophic ecology is unknown. Due to this, the diet was examined using the stomach contents and stable isotopes analysis. The individuals were collected with fish pots during two seasonal research expeditions in May and August of 2018. The δ15N and δ13C values were significantly different between size classes, indicating ontogenetic shifts in habitat use and consumption of prey. The δ13C shows that the triggerfish tends to feed in areas closer to the coast and his source of its origin can possibly change from the pelagic zone when they are juveniles, to the benthic trophic networks in his adulthood. The trophic position mean according to Bayesian inferences and Post's estimates was 2.98 and 3.03 and increased with size. Likewise, isotopic niche width corroborates the ontogenetic shift related with the maturity groups.

Using Evidence From Voluntary Fisheries Data Collection Programmes to Support Marine Spatial Planning and Resolve Multiple-Use Conflicts

Natural disasters have altered the landscape of Montserrat’s marine environment significantly over the past 30 years, forcing rapid adaptation of marine species and the human population that relies upon them. Volcanic activity has led to an abundance of volcanic sediment, which has seen rise to the expansion of the island’s sand mining and aggregate industry. Similarly, a series of volcanic eruptions has resulted in smothered fishing grounds and maritime exclusion zones, increasing the pressure on the remaining accessible marine environment. Recent increases in shipping activity, due to the expanding aggregate sector, partnered with a lack of official marine spatial planning, has led to the west coast of the island becoming a stakeholder conflict hotspot. Regular interactions between fishing gear and shipping vessels were resulting in damaged and lost fish pots and causing physical damage and increased ghost-fishing on the coral reefs, with additional impacts on fisher livelihoods. This paper builds upon earlier work in Montserrat to engage fishers in fisheries data collection programmes. Here we use data from Montserrat’s fishing fleet to understand the distribution and intensity of fish pot activity within the conflict area. Maximum activity was distributed along the edge of the reef front, near the drop-off, with the greatest intensity toward the south. These data, and outcomes from stakeholder consultation, have allowed the relevant authorities and decision-makers to identify a suitable shipping route that avoids pot-based fishing grounds, while remaining as close inshore as feasible, to avoid unnecessary fuel costs for shipping vessels. As a result, the Montserrat Port Authority has implemented a restricted area around the identified fishing grounds, in which commercial vessels are not allowed to transit. This intervention represents a “win-win” solution, reducing the risk of commercial vessel-fishing gear conflict in the southwestern pot-based fishing grounds, without substantially increasing the burden of excess travel on commercial vessels. Here we show how engagement with the fishing community and voluntary participation in data collection has supported a conflict resolution deemed suitable to both parties; allowing the needs of the smaller traditional fishing sector to influence management of the rapidly expanding, high value aggregate sector.

Kuzey Ege Denizi’nde kullanılan çapari takımlarının av kompozisyonu

In this study was carried out between April 2015 and January 2017 at 0-120 m depth areas where commercial fishermen were fishing in North Aegean Sea, Çanakkale coasts. In this study, it is aimed to determine the species composition of caught species in trotline fishing and to determine the target and non-target catch rates. 6 different trotline types were used. As a result of 174 catching operations 7210 individuals were catched in total. When the ratio of the target species in catching with the trotlines are evaluated, the trotlines within the fishing gears such as fish pots, trammel nets and longlines catch more of the target species.

Using an innovative net-pen-based observation method to assess and compare fish pot-entrance catch efficiency for Atlantic cod (Gadus morhua)

In many places, gillnet fishing is considered a conservation threat for air-breathing marine species. Fish pots represent an alternative to gillnetting; however, due to their low catch efficiency pots are rarely taken up by commercial fisheries. To improve pot efficiency for Atlantic cod (Gadus morhua), we used a novel enclosure to observe cod interacting with pot entrances, and investigated several entrance design parameters, including funnel colour, entrance funnel presence, length and entrance form. We demonstrate that the key factor for entrance passage is to give cod an unobstructed view of the inside or outside when they try to enter or exit the pot, respectively. Funnel colour (colours tested: white, green and transparent) influences entrance passage rates, with significantly higher entrance passage rates for the transparent funnel. Funnel presence increases the entrance encounter rate by enlarging the outer opening of the entrance. It decreases exit rates by deflecting cod away from the inner entrance opening and by reducing the area in which the exit is perceptible to cod inside the pot. Increasing funnel length further reduces this area and may deter cod by the longer passage length. This is the first study to observe cod–pot interactions day and night using an infrared camera, revealing a pronounced diurnal pattern with few nocturnal entrance passages, suggesting that cod–pot interactions are primarily guided by vision. The findings underline the importance of funnels and reveals promising avenues for their further improvement, e.g., by using transparent fish retention devices. The new pen-based method is superior in several ways to conventional field-pot catch-rate comparisons: It allows identification of differences in catch efficiency and describes the underlying cod behavioural mechanism leading to these differences. Thus, it allows targeted, efficient and iterative cod-pot catch-efficiency enhancements.

Fish fauna of peatland waters in the middle Mahakam, Kutai Kartanegara, East Kalimantan, Indonesia

A field study was carried out to collect fish from the lake and streams/rivers around the peatland from December 2020 to February 2021. Fishing gears such as gillnet, snakehead pole and line, lift net, trap net ("sawaran", "julu"), and fish pot ("tokong", "pangilar", "bubu" or "lukah" and "tempirai") were operated. Sampling sites, water velocities, and water depth were measured using GPS Garmin 60 CSX, current meter hydrologic velocity meter, and fishfinder Portable, respectively. Generally, water velocities of streams measured were much more rapid than the lakes ranging between 0.33 m/s (at water depth: 4.20 m) and 0,69 m/s (at water depth: 6.80 m); and "not detected" (at water depth: 2.40 m) and 0.34 m/s (at water depth: 1.20 m) respectively. Of 7,377 fish samples, there were 50 species discovered belonging to 19 families. Cyprinidae was the most populated in individuals and species as well (1,022 Ind.; 21 taxa). It was followed by Bagridae (63 Ind.; five taxa), Channidae (53 Ind.; three taxa), Clariidae (10 Ind.; three taxa), Siluridae (403 Ind.; three taxa), while other families had just one taxon. Diversity was observed higher in streams (35 species) than lakes (30 species). Local fishers are still performing unselective fishing for feeding fish cage culture.

A Rare Case of Brugada Phenocopy in A Patient With Takotsubo Cardiomyopathy Masquerading as an Acute Coronary Syndrome

Brugada phenocopies (BrP) are clinical entities that are etiologically distinct from true congenital Brugada syndrome. BrP are characterized by type 1 or 2 Brugada electrocardiogram (ECG) patterns in precordial leads V1-V3. However, BrP is elicited by various underlying clinical conditions such as myocardial ischemia, pulmonary embolism, electrolyte abnormalities, or poor ECG filters. Upon resolution of the inciting underlying pathological condition, the BrP ECG subsequently normalizes. Takotsubo (octopus fishing pot) cardiomyopathy (TCM) also known as stress cardiomyopathy is an acute cardiac condition characterized by transient systolic dysfunction of the left ventricular apex and mid-ventricle with depressed LV function mimicking acute coronary syndrome (ACS) and recovers within a few weeks. TCM is most commonly seen in postmenopausal women with intense physical and or emotional stress. We are reporting a rare case of BrP in a patient with TCM masquerading as ACS posing a diagnostic and therapeutic challenge.

IFO (infrared Fish Observation) – An open source low-cost infrared underwater video system

Underwater video surveillance is an important data source in marine science, e.g. for behaviour studies. Scientists commonly use water resistant ruggedized monitoring equipment, which is cost-intensive and usually limited to visible light. This has two disadvantages: the observation is limited to space and time where visible light is available or, under artificial illumination, behaviour of marine life is potentially biased. Infrared (IR) video surveillance have been used before to overcome these. It records videos at visible light and under IR-illumination. With today’s efficiency of IR-LED and video technology even low-cost systems reach visibility ranges suited for many application scenarios. We describe a low-cost open-source based hardware/software system (iFO). It consists of a single-board computer controlling the camera and lamps (with high power IR-LEDs), printed circuit boards (PCB), the underwater housings and 3D-printable models to mount PCBs in the housings and the housings to standard GoPro mounts. The Linux based software includes webserver, remote control, motion detection, scheduler, video transfer, storage at external hard disk and more. A ready-to-use SD-card image is included. We use rugged underwater housings with 100 m (optional 400 m) depth ratings. Finally, we describe a typical application observing the behaviour of cod in fish pots.

Analysis Model of Giant Prawns Population (Macrobrachium rosenbergii) in Estuary Edge of Sembakung Waters, Nunukan, Indonesia

HighlightThe sex ratio of giant prawns in the waters of fe- male groceries is 3 times higher than that of males.The growth characteristic of male and female giant prawns is negative allometry, but the male and female body shapes are fat.Total mortality, capture mortality, catch rate, male prawns are higher than females.The male infinitive growth is longer than the female,but the female’s growth rate is faster than male.AbstractGiant prawns (Macrobrachium rosenbergii) is a crustacean class that has the larg- est size and its habitat in Sembakung waters included brackish water (estuarine) with a salinity variable of 6.5+0.5 ppt and a temperature variable of 28.5+0.5OC and a variable pH of 6 (acidic). The objective of this research was to analyze the growth and mortality model of giant prawns (M. rosenbergii) that was taken from the catch of fisherman in the estuary, Sembakung sub-district, Nunukan Regency, Indonesia. The study was conducted for 3 months from November 2019 to Janu- ary 2020. The sampling was by using a survey method with purposive judgment sampling based on a catch of 14 fishermen who used the bottom fish pot from Sembakung waters, Nunukan Regency (Indonesia). The data collection included data of sex, total length, and the total weight of giant prawns. While analysis was employed for growth pattern, condition index, Von Bertalanffy growth, and mor- tality. The results obtain the sex ratio of male and female giant prawns 1:3.67. The growth pattern of male and female giant prawns were allometric negative. The growth of the von Bertalanffy model for infinitive growth of male giant prawns were 21.219 cm and female were 18.42 cm, respectively the mortality from giant prawns obtain total male mortality is 2,257, catch mortality is 1.92 and natural mortality is 33.75% with an exploitation rate of 0.85 (85%). The total female mor- tality is 1.528, catch mortality is 120.1% and natural mortality is 32.69% with an exploitation rate of 0.786 (78.6%).

The analysis of economic feasibility from Bubu Dasar fishing gear (Bottom fish pots) in Tepian Muara Sembakung, Nunukan (Indonesia)

The society of Tepian Muara Sembakung village, Nunukan Regency (Indonesia) render Sembakung waters as a potential resource that can be used as one of their income. The fisherman used Bubu Dasar fishing gear (Bottom fish pots). This research aims to analyze the economic feasibility business model of Bubu Dasar fishing gear (Bottom fish pots) in Tepian Muara Sembakung, Nunukan Regency, Indonesia. The sampling was conducted for 3 months, from November 2019 to January 2020. The research used a quantitative descriptive method with a case study approach. The Data was collected using survey with interview, observation based on catches from bottom fish pots as many as 14 times, and laboratory-scale method by doing identification of main catch, such as giant prawns (Macrobrachium rosenbergii) and by-catch composition like mangrove crab (Scylla serrata); catfish (Pangasius hypophthalmus); crossbreed fish (Plotosus canius); cand hopstick fish (Toxotes jaculatrix). The results obtained an average daily income of fishermen was IDR 379,286 with an average gross income in each month was IDR. 3,792,857 with total expenses in the form of maintenance costs, depreciation costs and operational costs of IDR. 444,868, so the average profit of fishermen in each month was IDR. 3,347,990. The business analysis can be seen from the average ROI index value as 33.4; the average BEP index value was 12.4 and the average benefit cost ratio (B/C ratio) index was 8.5, so the results of the three indices explain that the bottom fish pots business analysis results are profitable and worthy of profit catching giant prawns (M.rosenbergii) using bottom fish pots in Tepian village, Sembakung subdistrict, Nunukan district.

The growth model composition of giant prawns (Macrobrachium rosenbergii) In Muara Tepian Sembakung, Nunukan

Giant prawns (Macrobrachium rosenbergii) has high economic value with a price range between IDR. 40,000 to IDR. 75,000 that it was one of the main catches of fishing gear used by the society in Muara Tepian Sembakung. This research aims to analyze the growth model composition of giant prawns (M. rosenbergii) in Muara Tepian Sembakung, Nunukan. The objective was conducted for 5 months from October 2019 to February 2020. The research was designed by using quantitative descriptive with a case study approach. The determination of the study location was applied with a purposive random sampling method by following the fishermen who used the bottom fish pots catch. The sampling of giant prawns at Muara Tepian Sembakung was done by taking a survey method adhered to a fisherman with repetition as 10 times of sampling at a different time. The data of Giant prawns that were collected involved sex, total weight, and total length using a laboratory-scale method in the Laboratory of fisheries biology, Fisheries and marine science faculty, Universitas Borneo Tarakan. The research variable was the von Bertalanffy model and age structure of male and female giant prawns. The results obtained that the sex ratio of giant prawns (Macrobrachium rosenbergii) between males and females was 1: 1.83 with a percentage of a male was 35.33% and female was 78.6%. The growth of Von Bertalanffy model in getting the infinitive growth for male giant prawns was 24.185 cm at 132 days then T0 was -1.1088 and growth rate was 0.0877 cm/day with correlation value was 0.88431 (88.431% = very strong correlation) and female giant prawns amounted to 18.470 cm at 101 days whileT0 was -1.0734 days and the growth rate was 0.1019 cm/day with a correlation value was 0.90626 (90.626% = very strong correlation).

Pots vs trammel nets: a catch comparison study in a Mediterranean small-scale fishery.

Passive bottom-set nets are the most widely used fishing gears in Mediterranean small-scale fisheries (SSFs). Trammel nets, in particular, have key advantages such as their ease of use and handling and high capture efficiency for numerous commercial species. However, they entail high discard rates (5–44% of the total catch) connected to high mortality, thus exerting an adverse impact on benthic communities, besides catching individuals of commercial species under the minimum conservation reference size (MCRS) and specimens of protected species. Fish pots are seen as alternative and a more sustainable gear type that allow reducing discards in SSFs. In this study, a collapsible pot was tested at three coastal sites in the north-western Adriatic Sea (GFCM GSA 17) to compare its catch efficiency with that of the local traditional trammel nets. Data analysis demonstrated a similar catch efficiency for the commercial species, both among sites and as a whole. Moreover, the trammel net caught a larger amount of discards, both in terms of species number and of CPUEW. The catch comparison study involved the two most abundant landed species, common cuttlefish Sepia officinalis and annular sea bream Diplodus annularis. The pots were more effective for S. officinalis, whereas the trammel net was more effective for the shorter length classes for D. annularis, which were mostly under the MCRS (12 cm). The innovative pots could provide a valuable alternative to the trammel nets traditionally used in the Adriatic Sea, at least in certain areas and periods. Their main advantages include that they do not require a different rigging and they can be used without bait, while their foldable design allows large numbers to be easily loaded on board SSF vessels. The results of this pilot study indicate that pots can achieve the objectives of reducing discards and bycatch in SSFs without penalizing the catch of commercial species.

Status of Fisheries in Agusan Marsh: Lapaz and Talacogon, Agusan del Sur, Mindanao

In support to policy formulation of fisheries in Agusan Marsh, a stock assessment was conducted for the period of May 2014 to December 2016 using the data collected from Lapaz and Talacogon, Agusan del Sur within the Agusan Marsh. Results showed that Lapaz contributed 54% of the catch over Talacogon. A total of eighteen species, belonging to 13 genera and 11 families with 7 native and 11 introduced species were found in the marsh. Majority of the total catch consisted of Channa striata, Oreochromis niloticus, and Cyprinus carpio (35%, 27%, and 26%, respectively). Osphronemus laticlavius, Glossogobius celebius and Mugil cephalus were listed as seasonal species. An invasive janitor fish (Pterygoplichthys disjunctivus) was observed as by-catch. A strong pattern of high catch rates occurred during the rainy months of January, February, June, and December. Ten types of commonly used fishing gears were found, majority of which include fish pots, set gillnets, electrofishing and set long lines. Multivariate analysis showed similarity in species composition both in Lapaz and Talacogon. Exploitation of dominant species showed unsustainable level for O. niloticus, C. batrachus, C. caprio, andC. gariepinus, mainly due to excessive capture of immaturesized fishes by major fishing gears. The estimated exploitation rate is beyond the optimum level for O. niloticus and C. carpio in both years and followed by C. striata and C. gariepinus in 2016. Only C. bartachus is estimated to be exploited below the optimum level. Generally, the key species in Agusan Marsh are at risk of overfishing, hence, immediate policy measures must be given high attention.

Composition and catch rate of folded cube fish pots in the sea of Tuban Regency

This study aimed to determine the composition and catch rate of folded cube fish pots in the seawater of the Tuban Regency. The research was conducted in December 2018 located in the Sokorejo, Tuban Regency, using 30 units of folded cube fish pots with a size of 50x50x50 cm2. The cube folded trap installation was done in 10 times of catch trip and installed in the morning. The catches were collected, identified, and measured for their individual length and weight. The crabs were measured for the length and width of their carapace. The catching result of folded cube fish pots was classified into five types which are fish group (48.97%), crabs group (29.59 %), swimmer crabs (7.1%), Land hermit crab (6.12%), and mud snails (8.16%). The result showed that Two-spined Arm Swimming Crab (Charybdis anisodon) was the most dominant type of catch equal to 29.59% of the total catch, while other types of catch that were quite common are Pig Faced Leather Jacket (Paramonacanthus choirocephalus) (9.18%), and Crescent Pearch (Terapon jarbua) (8.16%). The average catch rate for folding cube was 32%/trip with a weighted average catch of 436.58 gr/trip.

Application of foldable cube and cylinder fishing pot in Tuban Regency water

Fishing pot is an environmentally friendly fishing gear that has been used by fishermen in Indonesia with all kinds of shapes and sizes. This study aimed to determine the composition of the catches using a modified cube folding trap and tube folding trap, as well as provide design information material to develop environmentally-friendly fishing gear. The research was conducted in Socorejo Village, Jenu District, Tuban Regency, East Java, in October-December 2018. The method of this research used experimental fishing with 30 units of cube folding trap and 30 units of tube folding trap. Traps were operated long lines at 10 different coordinate points and the results were analyzed further using the T-test with 95% of confidence level. The catch composition of cube and tube folding traps shows the largest catches in percentage are swimmer crab as much 65% and 57%. The value of catches composition cube and tube folding trap is 0.169 and 0.227 which indicate that cube folding trap is more selective. Based on the results of T-test, total and weight of the catches between cube and tube folding trap show no significant difference. The results conclude that the cube folding trap is more effective with more catches.

Comparing the roles of Pacific halibut and arrowtooth flounder within the Gulf of Alaska ecosystem and fishing economy

AbstractThe fishing industry of the western and central regions of the coastal Gulf of Alaska (CGoA) directly employs over 17,000 people and processes fish with a wholesale value of US$618 million annually. Pacific halibut (Hippoglossus stenolepis) are a valued groundfish species because of the high quality of their flesh. In contrast, arrowtooth flounder (Atheresthes stomias) are much more abundant but of low value because their flesh degrades upon heating. Both are high trophic level predators but play different roles in the ecosystem because of differences in abundance and diet. Using an end‐to‐end ecosystem model, we evaluate the impact of alternate levels of fishing effort and large‐scale changes in oceanographic conditions upon both species, the ecosystem, and the fishing economy. Reduction of longline efforts to reduce Pacific halibut mortality led to reduction in total value of all CGoA landings but increase in value landed by sport fisheries, trawl fleets, and fish pot vessels as they exploit a greater share of available halibut, sablefish, and Pacific cod. Increased trawl effort to raise arrowtooth flounder mortality led to increase in total value of all landings but large reductions in value landed by longline, jig, fish pot, and sport fleets with greater competition for available Pacific cod, halibut, and sablefish. Oceanographic conditions that enhance pelagic food chains at the expense of benthic food chains negatively impact groundfish in general, though Pacific halibut and arrowtooth flounder are resilient to these effects because of the high importance of pelagic fish in their diets.